A Twilight of Empires

Converting MSP into Ship Units

This is a replacement for 5.2.5 required by the
limitation on unit build types
in A Twilight of Empires. Specifically, not every
nation has the ability to build HT units.

Instead, use this:

At any point during the turn MSP on a trade route may be turned into
transport units, i.e. HT, T, or XT as available. MSP are
converted to such units of equal cargo value, at least half of which
must be of the highest cargo value. The cost in gp is equal
to the cost of the unit into which they are converted.

Regardless of when MSP are nationalized they will be removed from trade
for the entire turn, and thereafter. The militarized ships are
to appear at the Base Port of the Route from which they were converted.
Please note that attempts to "game" the system in order
to extract gp or nfp will be nullified.

Example

The ever-industrious Frisian king, Aethelwoof, realizes that he needs to
transport his new army of horse archers across the sea. Merchant
shipping is his only hope, and so he approaches the bourgouisie with
a command to turn over their ships in return for a nominal fee.

If 40 MSP are to be converted, this will give 40 cargo value worth of
hulls. The Frisians had recently discovered how to
build full-sized transports (T units) at 4gp/3nfp each, carrying
3 cargo per unit. At least 20 MSP must convert to these, so we
have (7 units) × (3 cargo/unit) = 21 MSP, costing (7 units)
× (4 gp/unit) = 28gp. This leaves 19 MSP as XT
units at 2 cargo (3gp/2nfp) each. Dropping fractions as usual, 9
units are
available, costing 27gp. In the end, 40 MSP become 7T,9XT
with an out-of-pocket cost of 55gp, not counting the lost trade income.

Overwhelmed by numbers in the merchants' contracts, a foe he could
subdue with neither sword nor axe, Aethelwoof took to his bed.

Other combinations of unit type and number would give different
results in the example above. As they say, your mileage may vary.